In The Void (H) (static): Part of the Call of the Forsaken expansion, Zebuxoruk is again the lone occupant of The Void. (For all things related to Call of the Forsaken, check out this overview of the expansion.)

In The Void (H) (instanced): Part of the Call of the Forsaken event "The Journey Home" (see this quest entry for details about the group version and this quest entry for details about the raid version).